Code Value Notes
Alpha-2 OM Alpha-2 code from ISO 3166-1
Alpha-3 OMN Alpha-3 code from ISO 3166-1
Numeric 512 Numeric code from ISO 3166-1
ITU OMA Codes assigned by the International Telecommunications Union
FIPS MU Codes from the U.S. standard FIPS PUB 10-4
IOC OMA Codes assigned by the International Olympics Committee
FIFA OMA Codes assigned by the Fédération Internationale de Football Association
DS   Distinguishing signs of vehicles in international traffic
WMO OM Country abbreviations used in weather reports from the World Meteorological Organization
GAUL 187 Global Administrative Unit Layers from the Food and Agriculture Organization
MARC mk MAchine-Readable Cataloging codes from the Library of Congress
DIAL 968 Country code from ITU-T recommendation E.164 (international dialing code)
TLD .om Country code Top Level Domain